RACK: adding a query parameter before call

Hey

I'm trying to add a query parameter before the call to my rails
app ... through Rake

Thought itd of been simple, but struggling...

Can anyone help?

thanks

Hmmm...... should I focus on adjusting the request or the 'env'
variable when I call the app?

Is this some kind of initialization code that needs to be called when
the app is started?